and jackie harbaugh. for their sons it is just another day at the office, as their two teams prepare for the biggest game of their lives. at 49ers practice, head coach jim harbaugh watched closely as he put his time to work. not too far away, harbaugh's brother, john, guided his baltimore ravens through their drills. but even tough as nails ray lewis found time to crack a joke. the harbaugh brothers will go head-to-head in what is being dubbed the harbowl. >> no one talks to anyone. jim is very quiet and guarded. john is very quiet and guarded. that's exactly the way we wanted them. >> reporter: their mother she is more optimistic. >> this is like -- frosting on the cake for our whole family. >> reporter: odd makers have the 49ers favored by 3 1/2 points. but the super bowl is in new orleans, so if you want a prediction ask the expert at reverend zombie's house of voodoo. even then there is no clear answer. >> your regret is upside down. and their, their sorrow is side ways. i can't really say. but, i can say it looks -- you're looking pretty good. i would shore up the offense though

francisco's first super bowl appearance in 18 years and coach jim harbaugh says the team is "super happy to be there." >> and the ravens travel to the big easy today after final practices at their training complex in maryland. john harbaugh said his team is excited but he can see the niners are a well-coached team. and fans in maryland and the bay area and beyond are getting ready for the big games. so we want to see that team spirit here on "world news now." >> show us the way you're showing your pride. tweet us photos or send them to our e-mail address which you can find on our facebook page. wnnfans.com. >> not just any old thing, like eating some fig newtons. >> some creative. >> some legit fans, show that spirit and we'll get the best stuff on the air. >> dressed like a bird or something. a big purple bird or something. >> like a raven. like the mascot. something creative. >> i would like to see something dynamic. >> we're challenging our viewers out there, all four of you. we want to see what you've got leading up to the super bowl. so send that stuff in and we'll try to get it on

the same kind of thing. >> i want to thank my parents, jack and jackie harbaugh and go, ravens. >> i don't know if we had a dream this big. we had a few dreams, we had a few dreams, a few fights, and arguments. >> which brings us to today, which is of all things opposite day. >> we're on, okay, good. >> read the prompter. >> there are probably endless ways to celebrate this day. spongebob squarepants did a whole episode on it. so whatever way you choose to confuse people, enjoy. >> we're switching roles today. i'm taking the willis position. >> 15 seconds. >> the only difference is i'm awake. >> wrap it up. >> it's not that hard. >>> this morning, north korea's nuclear threat. >> and is it aimed at america? the secretive nation says upcoming missile tests are meant to target the u.s. we're live in seoul. >>> travel danger. snow is set to create treacherous travel conditions for a quarter of the nation today. and that record cold isn't over yet. >>> luxury living. a squatter moves into a multimillion-dollar mansion with nothing his neighbors can do about it. >>> plus, this -- >> is it

army. everyone is wearing the same uniform. >> i want to thank my parents, jack and jackie harbaugh and go, ravens. >> i don't know if we had a dream this big. we had a few dreams, we had a few fights and arguments. >> which brings us to today, which is of all things opposite day. >> we're on, okay, good. >> read the prompter. >> there are probably endless ways to celebrate this day. sponge bob square pants did a whole episode on it. so whatever way you choose to confuse people, enjoy. >> we're switching roles today. i'm taking the willis position. >> 15 seconds. >> the only difference is i'm awake. >> wrap it up.